DENTALIUM. 101 



colour bands. The specific name has, moreover, been used by Cossmann for a 

 fossil figured (' Essai Pal. Comp.' v, 4-6) from the Bathonian of Boulogne, showing 

 also several colour-bands. 



SCAPHOPODA. 



Genus DENTALIUM, Linnaeus. 



The records of Dentalium are as follows : 



D. annulatum (6, 25). D. gldbellum (6). 



*D. entaloides (3-1, 40, 43). 

 Only one species is intended by these names. This was discovered by Phillips 

 and figured amongst Cornbrash fossils without specific name. Bean, recording 

 all the Cornbrash fossils known to him, mentioned the name D. glabelluni, which 

 could only therefore refer to Phillips' specimen. Leckenby having collected some 

 Dentalia from the Kelloway Rock, Bean, convinced of their distinctness from 

 the Cornbrash form, named them annulatum, but Leckenby, not recognising it, 

 said the same species occurred in the Cornbrash, though all the specimens in his 

 collection are of the other kind. Finally, Lycett introduced a new name from 

 Deslongchamps, though both his figure and description refer to a specimen from 

 the Lower Calcareous Grit, as may be seen by the matrix ; but he refers to the 

 other specimen, which vice versa he calls a " Calcareous Grit example " as distinct, 

 giving the true distinctions. The only Dentalium, then, in the Cornbrash has 

 never been described, but only figured and named. 



Dentalium glabellum, sp. no v. Plate IX, fig. 12. 



1835. Dentalium, Phillips, Geol. Yorks., pi. iv, fig. 37. 



1839. Dentalium glabellum, Bean, Ann. Mag. Nat. Hist. [2], vol. ii, p. 61 (n. n.). 



Type. — Length 44 mm. ; diameter 5 - 5 mm. ; rate of increase immeasurable — 

 practically nil, say 1 in 60 ; radius of curvature 96 mm. Surface as smooth as 

 possible, only the finest lines of growth observable, most easily seen at the larger 

 end. From Scarborough. In the British Museum. 



Distribution. — Ten examples have been seen from Scarborough — all of them 

 from the Cornbrash, agreeing with the above. 



Relations. — The Dentalia from the Lower Calcareous Grit which have been 

 mistaken for Cornbrash specimens and referred to D. entaloides, have a more rapid 

 rate of increase, a greater curvature, and the smaller end beautifully covered 



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